Sorcs are the strongest..and the weakest..
Points for being strong:
1) Self healing, we can keep ourselves alive through alot.
2) Burst DPS output from lightning rivals the best DPS.
3) Utility, we can move anyone on our team to us. We can sprint, and we can dominate things like huttball easily.
4) Our CC/Stun/Interrupt are all relatively strong.
Points for being weak:
1) We die the fastest of any class, because we have light armor and the lowest base HP of any class.
2) We have no reliable way to get multiple people off of us, once overload is used it's game over.
3) We are incredibly susceptible to interrupts, marauders particularly with their 6 second interrupt makes them ideal to complete shut down a healer or DPS sorcs main abilities.
4) We have the lowest stat bonuses (as far as endurance goes) on PvP and PvE gear. Don't believe me? Go compare it with any class, you can easily look up the stats on the vendors.
Point and case, we are glass cannons. Yes we might seem overpowered, but the people who say 'if you can't handle a sorc l2p' are fairly accurate. If left alone we can decide a fight completely on our own, regardless of spec. Handled appropriately we are an easy target.
Alternatively I believe it's a side-case of 'when the weapons in the right hands' I have seen incredible players of all classes. A good player can make any class seem 'OP'.